Improvement in wood-planing machines



'AQDAVIS. Wood Planing-Machines. Flu 154,947, 4 Pater at ed Sept. 15,1874.

mzw.

U NITED STATES PATENT OFFICE.

ASAHEL DAVIS, OF LOWELL, MASSACHUSETTS.

IMPROVEMENT IN WOOD-PLANING MACHINES.

Specification forming part of Letters Patent No. 154,947, dated September 15, 1874 application filed February 27, 1873.

To all whom it may concern:

Be it known that I, AsAHEL DAVIS, of Lowell, in the county of-Middiesex and State of Massachusetts, have invented certain Improvements in Wood-Planing Machines, of which the following is a specification:

The nature and object of this invention relate to the combination of the springs or other mechanical devices with the feeding or pressure rolls, being so placed that the rolls shall not fall in any degree in the path of the board below its top surface to obstruct, and thus cause a clip at or near the end of the board.

The figure here shown represents an end view of that part of the machine embodying my invention.

A and O are the back and front rolls; B, the cylinder or cutter head; D D, the springs un der the rolls. E E are the adjusting setscrews; F, the board; G, the spring over the front roll, 0.

In general, my machine is made substantially as all other machines for similar work, except that in all other machines, as far as I know, a spring lever or weight is used to press the rolls upon the surface of the board while being planed, the effect of which causes the roll to drop below the cut of the knife or cylinder B when the board is out.

If the knife is set out on the cylinder for a heavy chip the roll A should be set down to the surface of the board planed. If the knife is set in on the cylinder B for a light chip the roll A must rise to let the board pass through.

When the board strikes the roll A with the spring lever or weight above the roll it delays the board somewhat from passing through until the roll is raised to the surface of the board planed, thereby causing the clip at or near the end of the board; but, by means of the spring D under the roll A, in combination with the set-screw E, the roll can be readily adjusted avoiding the dropping of the roll in the track of the board, and thus preventing the clip.

The set-screw E, over the roll A, which effectually makes a stationary bar, though rolling, prevents the tremble of the board, which would necessarily wave the springs, and thereby give roughness and unevenness to theboard. It also prevents the board fromgradually lifting on the roll as it passes out, thus avoiding the clip at the last end of the board. The same adjustment is accomplished on roll 0 by means of the under spring D, in combination with set-screw E, said spring D being depressed somewhat below the cut of the knife on cylinder B in order to attain greater variation for feeding the board through when too thin for the cylinder, and by spring Gyvhen the board is thicker than the gage of the cylinderz The under spring D also serves to prevent the roll 0 from catching the end of the board as it passes from under the roll, and lifting the board, thus causing a clip, as it does without the under spring.

Having thus described the device as, in practice, I am using the same, I make no claim to the feeding or pressure rolls, or to the springs or other device when placed to give pressure on the board, for I am aware that these are not new; but

What I claim as my invention is- 1. The combination of the springs D and feeding or pressure rolls A, in the manner and for the purpose herein shown and described.

2. The adjusting set-screws E, in combination with the under spring D and rolls A, arranged in the manner as and for the purpose specified.

ASAHEL DAVIS. Witnesses:

JAMES CARMIOHAEL, WHEELOOK G. TILroN. 

